1. Department of NeurosurgeryBeijing Tongren Hospital, Capital University of Medical Sciences, Beijing, China
2. Cerebrovascular Diseases Research InstituteKey Laboratory of Neurodegenerative Diseases of Ministry of Education, Xuanwu Hospital, Capital Medical University, Beijing, China
3. NeurosurgeryWayne State University, Detroit, MI, USA
4. Department of NeurosurgeryBeijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, China